( BW)(CO-MARKWEST-ENERGY/HYDRO)(MWE)(MWP) MarkWest Energy Partners and
MarkWest Hydrocarbon Announce Record Date and Shareholder Meeting Date

Business Editors/Energy Editors

DENVER--(BUSINESS WIRE)--Jan. 3, 2008--The board of directors of
the general partner of MarkWest Energy Partners, L.P. (NYSE: MWE) and
the board of directors of MarkWest Hydrocarbon, Inc. (AMEX: MWP) today
announced the record dates and meeting dates for the special meetings
to consider, among other items, the approval and adoption of the
Agreement and Plan of Redemption and Merger between MarkWest Energy
Partners, L.P. and MarkWest Hydrocarbon, Inc. The record date for both
companies will be January 14, 2008, and the meetings will be held on
February 21, 2008, in Denver, Colorado.

MarkWest Energy Partners, L.P. (NYSE: MWE) is a publicly traded
master limited partnership with a solid core of midstream assets and a
growing core of gas transmission assets. It is one of the largest
processors of natural gas in the Northeast and is the largest gas
gatherer of natural gas in the prolific Carthage field in east Texas.
It also has a growing number of other gas gathering and intrastate gas
transmission assets in the Southwest, primarily in Texas and Oklahoma.

MarkWest Hydrocarbon, Inc. (AMEX: MWP) controls and operates
MarkWest Energy Partners, L.P. (NYSE: MWE), a publicly traded limited
partnership engaged in the gathering, processing and transmission of
natural gas; the transportation, fractionation and storage of natural
gas liquids; and the gathering and transportation of crude oil. We
also market natural gas and NGLs.

This press release includes "forward-looking statements" within
the meaning of Section 27A of the Securities Act of 1933, as amended,
and Section 21E of the Securities Exchange Act of 1934, as amended.
All statements other than statements of historical facts included or
incorporated herein may constitute forward-looking statements. Actual
results could vary significantly from those expressed or implied in
such statements and are subject to a number of risks and
uncertainties. Although we believe that the expectations reflected in
the forward-looking statements are reasonable, we can give no
assurance that such expectations will prove to be correct. The
forward-looking statements involve risks and uncertainties that affect
our operations, financial performance and other factors as discussed
in our filings with the Securities and Exchange Commission. Among the
factors that could cause results to differ materially are those risks
discussed in our Form 10-K/A for the year ended December 31, 2006, as
filed with the SEC. You are urged to carefully review and consider the
cautionary statements and other disclosures made in those filings,
specifically those under the heading "Risk Factors." We do not
undertake any duty to update any forward-looking statement.

Although we believe that the expectations reflected in the
forward-looking statements, specifically those including those
referring to future performance, growth, cash flow, operating income,
distributable cash flow (DCF), distributions, or other factors, are
reasonable, these forward-looking statements are not guarantees of
future performance and we can give no assurance that such expectations
will prove to be correct and that projected performance or
distributions may not be achieved. Among the factors that could cause
results to differ materially are those risks discussed in our Form
S-1, as amended, our Annual Report on Form 10-K/A for the year ended
December 31, 2006, and our Quarterly Reports on Form 10-Q, as amended,
each as filed with the SEC. You are also urged to carefully review and
consider the cautionary statements and other disclosures, including
those under the heading "Risk Factors," made in those filings, which
identify and discuss significant risks, uncertainties and various
other factors that could cause actual results to vary significantly
from those expressed or implied in the forward-looking statements. We
do not undertake any duty to update any forward-looking statement.

MarkWest Energy Partners and MarkWest Hydrocarbon filed a
preliminary joint proxy statement/prospectus and other documents with
the Securities and Exchange Commission (the "SEC") in relation to the
merger transaction announced on September 5, 2007. Investors and
security holders are urged to read these documents carefully because
they contain important information regarding MarkWest Energy Partners,
MarkWest Hydrocarbon, and the transaction. A definitive joint proxy
statement/prospectus will be sent to security holders of MarkWest
Energy Partners and MarkWest Hydrocarbon seeking their approval of the
transactions contemplated by the redemption and merger agreement.
Investors and security holders may obtain a free copy of the joint
proxy statement/prospectus and other documents containing information
about MarkWest Energy Partners and MarkWest Hydrocarbon, without
charge, at the SEC's website at www.sec.gov. Copies of the joint proxy
statement/prospectus and the SEC filings that will be incorporated by
reference in the joint proxy statement/prospectus may also be obtained
free of charge by directing a request to the entities' investor
relations department at 866-858-0482, or by accessing the companies'
website at www.markwest.com.

MarkWest Energy Partners, MarkWest Hydrocarbon, the officers and
directors of the general partner of MarkWest Energy Partners, and the
officers and directors of MarkWest Hydrocarbon may be deemed to be
participants in the solicitation of proxies from their security
holders. Information about these persons can be found in the Annual
Report on Form 10-K/A for the year ended December 31, 2006, for each
of MarkWest Energy Partners and MarkWest Hydrocarbon, as filed with
the SEC, and additional information about such persons may be obtained
from the joint proxy statement/prospectus when it becomes available.

This document shall not constitute an offer to sell or the
solicitation of an offer to buy any securities, nor shall there be any
sale of securities in any jurisdiction in which such offer,
solicitation, or sale would be unlawful prior to registration or
qualification under the securities laws of any such jurisdiction. No
offering of securities shall be made except by means of a prospectus
meeting the requirements of the Securities Act of 1933, as amended.

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CONTACT: MarkWest Energy Partners, L.P. and
MarkWest Hydrocarbon, Inc.
Frank Semple, 866-858-0482
President & CEO
or
Nancy Buese, 866-858-0482
Senior VP & CFO
or
Andy Schroeder, 866-858-0482
VP Finance & Treasurer
Fax: 303-925-8709
investorrelations@markwest.com
www.markwest.com

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